#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <mpi.h>


int main(int argc, char *argv[])
{
        int length;
        int nprocs,rank;
        char *nodename;

        MPI_Init(&argc, &argv);
        MPI_Comm_size(MPI_COMM_WORLD,&nprocs); 
        MPI_Comm_rank(MPI_COMM_WORLD,&rank); 
        nodename = (char *)malloc(1024 * sizeof(char));
        MPI_Get_processor_name(nodename, &length);

        printf("%s: hello world,length=%d,my rank=%d\n",nodename,length,rank);

        MPI_Barrier(MPI_COMM_WORLD);
        free(nodename);
        
        MPI_Finalize();
        return 0;
        
}